The human sigh acts as a physiological reset button.
23
Modern humans first appeared about 200,000 years ago, but record keeping didn't begin until about 6,000 years ago. That means about 97% of human history is lost.
21
A person can live without food for about a month, but only about a week without water.
156
It has been scientifically proven that stroking a cat can lower one's blood pressure!
456
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
On average, there's 100 billion neurons in the human brain.
83
The human brain uses approximately as much energy as a 10 watt light bulb.
120
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515